Design and testing of a high power piezo pump for hydraulic actuation
Nathan SellTom FeehallyAndrew PlummerPeter WilsonJonathan L. du BoisNigel JohnstonJens RoesnerAndrea de BartolomeisTom Love
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Abstract:
Traditional valve-controlled hydraulic cylinders are usually very inefficient due to power loss through the control valve. An efficient alternative architecture is to distribute power electrically rather than hydraulically to a group of cylinders and drive each cylinder via individual servomotor-driven pumps. This arrangement is called electrohydrostatic actuation. Such actuators are currently available for power ratings of several hundred watts or greater, but not in the sub-100 W range. This paper details the design, simulation and testing of a piezopump which is intended to address this gap. The motivation is for aerospace applications, and in particular accessory actuators used in the landing gear system. The 10–100 W range is a high-power output for a piezopump, and to achieve this a novel design using disc-style reed valves was developed to allow pumping frequencies above 1 kHz. These high frequencies necessitated the development of custom power electronics capable of delivering 950 V peak-peak sine wave excitation to a largely capacitive load. Experimental results show that the piezopump is capable of delivering over 30 W of hydraulic power, and at no-load can deliver up to 2 L/min of flow at 1250 Hz. Future development includes a transition to multi-cylinder pumps, and improved reed-valve modelling to improve the accuracy of simulated performance.Keywords:
Fluid power
Rotary actuator
Electro-hydraulic actuator
Check valve
Valve actuator
Direct drive electro-hydraulic actuator is a new type of hydraulic transmission with easy maintenance and high efficiency, which has been widely used in municipal engineering (such as water pipe network, gas pipe network), nuclear power plants, and other occasions. For these applications, we designed the electro-hydraulic valve actuator based on Internet of things technology (IOT for short). This paper introduces the mechanical structure and the working principle of the direct-drive electro-hydraulic valve actuator, analyzes IOT architecture. Detailed design was carried on according to the IOT architecture and related experiments have been done. The actuator can automatically, accurately control valve opening, be monitored by PC remotely, display device real-time information through LCD and be operated by touch screen.
Valve actuator
Rotary actuator
Electro-hydraulic actuator
Hydraulic circuit
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The performance of high speed electro-hydraulic actuator applied to piston variable displacement compressor was analyzed.According to the slow response of electro-hydraulic actuator driven by single high speed on/off valve,which was leaded by the restrained volume of high speed on-off valve,the solution that using a high speed on-off valve as the pilot valve and a secondary valve as the distributing valve was presented.The simulation results indicate that the high speed electro-hydraulic actuator response time fit practical work conditions.At the same time,the pilot structure of high speed electro-hydraulic actuator makes it possible to control open-close of distributing valve only by exporting one on/off signal on the high speed on/off valve.This solution improves system stability,decreases number of electro-valves,compared with multi-valve control method.
Valve actuator
Electrohydraulic servo valve
Valve timing
Piston (optics)
Electro-hydraulic actuator
Rotary actuator
Hydraulic circuit
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This chapter considers the output device of the hydraulic control system. This device, which the authors call the actuator, is the mechanism that is responsible for delivering force and motion to the external load system of a given application. The chapter considers two actuator types: linear actuators and rotary actuators. It discusses the performance characteristics of linear actuators. These characteristics include a consideration of the actuator efficiency and the quasi-steady operation and function of the actuator. Four hydraulic actuators are used to operate a car lift that is used within an auto mechanic garage. The chapter also discusses the performance characteristics of rotary actuators. The efficiency equations for the rotary actuator (hydraulic motor) are similar to those of the hydraulic pump and the discussion of pump efficiency measurement is also applicable to the efficiency measurement of the hydraulic motor.
Rotary actuator
Electro-hydraulic actuator
Lift (data mining)
Linear actuator
Plant
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Along with the development of the global economy and the marine,telecontrol system of valve to become one of the equipments that must install in the large,high automation ships,and the actuator of valve is the key parts of the telecontrol system of valve for a ship achieve homemade.This paper aims at the research and manufacture with an actuator of valve,compared several kind of rotary hydraulic actuator about their merit and shortcoming and the employ situation briefly,combine the characteristics of use on the ship,designed a sort of spiral hydraulic actuator with detent to use for the valve's drive in the valve control system of the ship,and discuss about the main design method of the spiral hydraulic actuator and the selection and assurance of the parameters.
Valve actuator
Rotary actuator
Electro-hydraulic actuator
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embankments and drainage system. These valves are driven by Winch, Electric Actuators, Hydraulic Actuators etc. which make use of electric motors. Winches and Hydraulic Actuators are large in size, but due to high reliability and strong lifting capacity, they are used to operate medium-to-large sized Valves. The operating speed of compact Electric Actuator is slow in case of small sized Valves but it is widely used due to its high precision control capability. This paper discusses the Research and Development of Electro-hydraulic Valve Actuator and its application. This hybrid Actuator has the advantages of both Winch and Hydraulic Actuators. The Electro-hydraulic Actuator is as small in size as the electric actuator but since it uses hydraulic power it can produce very high torque.
Winch
Rotary actuator
Valve actuator
Electro-hydraulic actuator
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Abstract In recent years, regenerative braking has been gradually proposed. Modular regenerative braking devices are installed near the wheel to recover the rotating kinetic energy when landing and convert it into hydraulic energy for braking. The core part of modular and integrated design is the actuator valve block. It is necessary to organically integrate all hydraulic components of an aircraft brake system, such as the on-off valve, hydraulic pump, motor, oil tank, accumulator, temperature and pressure sensor, one-way valve, relief valve, and oil filter. At the same time, it is very difficult to ensure high reliability, high strength, and a high power-weight ratio, and the temperature near the wheel is high, which can reach about 600°C when working. This is challenging for the design of the actuator valve block. In this paper, the integrated and modular brake actuator valve block is taken as the research object, and the actuator valve block is designed and developed using new technology, new structure, and new materials. Finally, the strength, stiffness, reliability, and weight of the actuator valve block meet the requirements of the brake system.
Valve actuator
Rotary actuator
Electro-hydraulic actuator
Pneumatic actuator
Safety valve
Hydraulic accumulator
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A robust sensorless control system to use in an electromotive valve actuator for combustion engines is described. The mechanical setup of a rotary valve actuator, which transfers the angular force by a bell crank to the valves, combines the advantage of variable mechanical and electromechanical valve drives because of adjustable stroke and opening time. The option to control several valves by a single actuator, to apply a single phase power supply and to operate the system without position sensor reduces the electronic equipment drastically. Further, low inertia and supporting springs minimize the power consumption.
Valve actuator
Rotary actuator
Valve timing
Flywheel
Pneumatic actuator
Electrohydraulic servo valve
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Taking the LBHF electro-hydraulic actuator which is used in a petrochemical company as an example,the paper introduces the working principle and main structure of special valve electro-hydraulic actuator and its application in the heavy oil catalytic unit.It analyzes the recent fault for the second-stage double acting slide valve,and summarizes the methods of judging and treating the common fault for electro-hydraulic actuator.In the end,it puts forward some advices to the safe production of special valve and its electro-hydraulic actuator.
Valve actuator
Hydraulic fluid
Safety valve
Check valve
Electro-hydraulic actuator
Control valves
Electrohydraulic servo valve
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This chapter considers the analysis, design, and control of valve-controlled hydraulic systems. The subject of valve-controlled hydraulic systems is most easily divided between the control of linear actuators (hydraulic pistons and cylinders) and rotary actuators (hydraulic motors). The chapter presents three valve-controlled hydraulic systems: the four-way valve-controlled linear actuator, the three-way valve-controlled linear actuator, and the four-way valve-controlled rotary actuator. Each of these hydraulic control systems is analyzed to determine the equation of motion that governs the dynamic behavior of the output load. Once the governing equation has been established the design of the hydraulic system is evaluated using steady-state forms of the governing equation. The chapter also presents various control schemes that may be used for each hydraulic system. These control schemes are classical proportional-integral-derivative controllers that are implemented for achieving position, velocity, and force or torque control of the valve-controlled system.
Rotary actuator
Electro-hydraulic actuator
Valve actuator
Control valves
Linear actuator
Telescopic cylinder
Position (finance)
Electrohydraulic servo valve
Plant
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